The merged file got warning with ffmpeg

[hellodword]

$ go version
go version go1.22.1 linux/amd64

$ ffmpeg -version
ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers

$ git log --oneline -1
2942c1d (grafted, HEAD -> main, origin/main, origin/HEAD) Bump github.com/stretchr/testify from 1.8.2 to 1.8.4

$ ffmpeg -y -f lavfi -i anullsrc=r=48000:cl=stereo -t 0.1 -b:a 192k -ac 2 1.mp3
$ ffmpeg -y -f lavfi -i anullsrc=r=48000:cl=stereo -t 0.1 -b:a 192k -ac 2 2.mp3

$ ffmpeg -i 1.mp3 
Input #0, mp3, from '1.mp3':
  Metadata:
    encoder         : Lavf58.76.100
  Duration: 00:00:00.14, start: 0.023021, bitrate: 226 kb/s
  Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 192 kb/s
    Metadata:
      encoder         : Lavc58.13

$ go run ./cmd/tui --output 3.mp3 1.mp3 2.mp3 
$ ffmpeg -i 3.mp3 
[mp3 @ 0x55837d41e280] Skipping 576 bytes of junk at 426.
Input #0, mp3, from '3.mp3':
  Metadata:
    track           : 1
    encoder         : https://github.com/crra/mp3binder, dev-build
    title           : Mp3binder
  Duration: 00:00:00.37, start: 0.000000, bitrate: 185 kb/s
  Chapters:
    Chapter #0:0: start 0.000000, end 0.168000
      Metadata:
        title           : 1
    Chapter #0:1: start 0.168000, end 0.336000
      Metadata:
        title           : 2
  Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 176 kb/s

I guess the Skipping warning means the XingFrame, right?

mp3 frame head &{Version:1 Layer:3 Protecttion:1 BitrateIndex:5 SampleRateIndex:0 Padding:1 Private:0 Mode:3 ModeExtension:0 Copyright:0 Original:0 Emphasis:0 SampleSize:1152 FrameSize:209}
mp3 bitrate:64000,samplerate:44100,channelcount:2
00000000  ff fb 52 c0 00 00 00 00  00 00 00 00 00 00 00 00  |..R.............|
00000010  00 00 00 00 00 58 69 6e  67 00 00 00 03 00 00 00  |.....Xing.......|
00000020  0e 00 00 1f 80 00 00 00  00 00 00 00 00 00 00 00  |................|
00000030  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000040  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000060  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000070  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000080  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000090  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000000a0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000000b0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000000c0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
000000d0  00                                                |.|